Improvement in mechanical movement



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FACTRING COMPANY, OF SAMEPLACE.

Letters Patent No. 70,063, dated October 22, 1867.

lIIIPNCVBIIIIINT IN MECHANICAL MOVEMENT.

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T0 ALL WHOM IT MAY `(.fOIlCERlI I Beit known that I, EDWIN ALLEN, of Norwich, in the county of New London, and State of Connecticut,

vhave invented-a new and useful Improvement in Mechanical Movements and I declare that the following isa sul'licicntly exact description of the same to enable one skilled in the art to which my invention appertains to 'make use of it, reference being had to the accompanying.;r drawing,which is made a part of this specification, land which represents a'face view of a pair of gearswhcels 'illustrating my invention.

My invention consists of a pair of gear-Wheels, of irregular form, adapted to transmit an equal relative rotation to two press-cylinders, one of which has` any desired number of straight surfaces or planes, and the -other convex surfaces corresponding -in number and superficial length` with the straight `surfaces of the first cylinder, as will be hereinafter` explained. Y The invention is applicableito presses for stamping, cutting, printing, or other purposes where it may be -found desirable to have strnight'surfaces-on one cylinder, acted o ri by convex surfaces on thc other, with uniform pressure, without friction or stoppage;

V,In the drawings, A represents a compound gear-wheel, whose pitch or working line is made up of three `chords a a a, of sixty degrees, united by ithree lsections,-Iea'ch composed of a curve, (concentric with the `w heel,) and two straight lines c c. D represen-ts a compound gear-wheel, `whose pitch or working v.line consists of three arcs d d d, of such length and convexity as to mesh accurately with the straight surfacesor chords v ma a of the wheel A, united bythree sections, each consisting of two curves c e', ofthe same radius as the curves and acurve,f, concentric with the wheel D and of such radius that the distance from gto L on the wheel D (measured around the pitch line) will be equal to the distance from tftoj on the wheel A. o

In :applying my invention, thewheel .A will bc keyed upon the sha-ft of'thc die-cylinder, or of the platenc'ylinderof a printing-press, or any other press-cylinder to which it maybe adapted and applied, so as to bring the planes a a a in exact coincidence with ',thc fiat surfaces upon which the platla dies, or other devices are mounted. -In like manner the wheel 1,3 is to be keyed upon the shaft of the pressureylihddrvi'tli its regular `curves d d d corresponding in position with the curved surfaces which bear upon the'fa'ce of the dies or type on the Iii-st cylinder. The curves d d eZ being made of equal length with the plancsfa a a, so as to adapt one to pass ,over the other without friction, it is manifest that the chords a will occupy a larger proportion of the periphery of the` wheel than thearcs cl, (their superficial length being equah) and hence that while the surfaces aand d, and the corresponding plane and curved surfaces of the presscylinders pass 'in contact at uniform speed, the mean distance of the pitch line of the arcs d from the centre of the wheel D should be less than that of the pitch line of the planes a from the centre ofthe 'wheel A. By this means' I adapt the wheels and their v cylinders respectively te rotate with uniform-spoed. The intermedia-te sections c I) e and ef e, constructed as described, ins'ure'the coincidence of the pressing'surfaces of the respective cylinders. It' the distance between the Vcentres .of the wheels A and D be ten ine'lresfthe radius of the curves cZ and e'should be two andeleventwentieth inches, and the curvef concentric with the wheel, as before explained.y

Having-thus described my invention, whatIelaim as new, and desire to secure by Letters Patent, is The gear-wheel A, constructed with one or vmore chords a, whose ends are connected by irregular sections c b c, in combination with the gear-wheel D, composed gef a corresponding number of arcs, d, with irregular connecting sectionsef, all as herein represented and described.

To the above speciiication of my improvement in mechanical movcments'l'have signed my hand this 23d. day ofAugust, 1867. y

EDWIN LLEN.

i Witnesses:

J. E. M. BOWEN, OcrAvIU's KNIGHT. 

